Gee, maybe spectros need an adjustable UV source to match the expected room lighting. Sounds like a nightmare, though. -- Ciao, Paul D. DeRocco Paul mailto:pderocco@ix.netcom.com > From: Bruce Fraser > > The hope is that the white in the output to which the white in the > source gets mapped would in fact be paper-white, no colorant, no > minimum density. UV-triggered optical brighteners can make > spectrophotometers see that paper white somewhat differently from our > eyes, though... - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.